Precision Time and Frequency Source and Systems Research and Development at The Johns Hopkins University Applied Physics Laboratory
Abstract
The Applied Physics Laboratory (APL) has a Time and Frequency Laboratory equipped with several hydrogen masers, cesium beam standards, and two Global Positioning Satellite receivers that are tied into the Bureau of the International Hour network of time standards. This laboratory gives APL the capability to perform much of our advanced research in time and frequency standards and provides reference signals with excellent short- and long-term stabilities. APL developed the NR Hydrogen Maser for NASA's Crustal Dynamics Project in the late 1970s and early 1980s. Since then, APL has continued research and development in advanced hydrogen maser technology under NASA's Research and Technology, Objectives and Plans Program. Two major areas of research activity are the source and state selector assembly for increased efficiency and the cavity design for a better temperature coefficient. Initial results of these activities will be presented in this paper. In addition to hydrogen maser research, APL has expanded research activities to supercooled quartz crystal oscillators and the integration of solid-state laser systems into quantum frequency standards. With respect to the laser systems, we will discuss our activities in optically pumped cesium standards and Fabry-Perot interferometers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1986
- Accession Number
- ADA497262
Entities
People
- A. G. Bates
- J. J. Suter
- M. C. Chiu
- M. T. Boies
- R. Kunski
Organizations
- Johns Hopkins University